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BA33D18HFP Datenblatt(PDF) 11 Page - Rohm |
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BA33D18HFP Datenblatt(HTML) 11 Page - Rohm |
11 / 18 page 11/15 BA3258HFP BA33Dxx series Datasheet TSZ02201-0R6R0A600090-1-2 26.2012 Rev.001 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 ●I/O equivalence circuit BA3258HFP BA33DxxSeries Fig.27 BA3258HFP I/O equivalence circuit Fig.28 BA33Dxx Series I/O equivalence circuit ●Power Dissipation If the IC is used under excessive power dissipation conditions, the chip temperature will rise, which will have an adverse effect on the electrical characteristics of the IC, such as a reduction in current capability. Furthermore, if the temperature exceeds Tjmax, element deterioration or damage may occur. Implement proper thermal designs to ensure that the power dissipation is within the permissible range in order to prevent instantaneous IC damage resulting from heat and maintain the reliability of the IC for long-term operation. Refer to the power derating characteristics curves in Fig.29. ・Power Consumption (Pc) Calculation Method ・Power consumption of 3.3V power transistor: PC1 = (VCC − 3.3) × IO1 ・Power consumption of VO2 power transistor: PC2 = (VCC − VO2) × IO2 ・Power consumption due to circuit current: PC3 = VCC × ICC →PC = PC1 + PC2 + PC3 Refer to the above and implement proper thermal designs so that the IC will not be used under excessive power dissipation conditions under the entire operating temperature range. ・Calculation example (BA33D15HFP) Example: VCC = 5V, IO1 = 200mA, and IO2 = 100mA ・Power consumption of 3.3V power transistor: PC1 = (VCC − 3.3) × IO1 = (5 − 3.3) × 0.2 = 0.34W ・Power consumption of 1.5V power transistor: PC2 = (VCC − 1.5) × IO2 = (5 − 1.5) × 0.2 = 0.35W ・Power consumption due to circuit current: PC3 = VCC × ICC = 5 × 0.0085 = 0.0425 (W) (See Fig.16 and 17) Implement proper thermal designs taking into consideration the dissipation at full power consumption (i.e., PC1 + PC2 + PC3 = 0.34 + 0.35 + 0.0425 = 0.7325W). *VCC: Applied voltage IO1:Load current on VO1 side IO2:Load current on VO2 side ICC:Circuit current * The ICC (circuit current) varies with the load. (See reference data in Fig.4, 5, 16, and 17.) VCC VO1 VCC VO2 V02_S VCC VO1/VO2 VO1 VO2 Controller 3.3 V output VCC GND VCC VCC Power Tr 1.5 V output or 1.8 V output IP ICC IO1 IO2 |
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